fix(bootstrap): remove --no-upgrade option from brew bundle

It can easily lead to issues where certain packages are not compatible
due to an older version already being installed. Hence we instead prefer
to just update all deps to the latest version

Author: jimeh

Makefile

@@ -51,7 +51,7 @@ bootstrap-ruby:
 	bundle install
 
 bootstrap-brew:
-	brew bundle --verbose --no-upgrade
+	brew bundle --verbose
 
 bootstrap-pip:
 	$(PIP) install -r requirements-ci.txt